Derive Debug and PartialEq on a few more types

src/message/mod.rs

@@ -155,7 +155,7 @@ Currently, an error may be returned in two cases:
 * the encodings of the arguments do not match the encoding of the method
   and the `verify_message` feature is enabled
 */
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 pub struct MessageError(String);
 
 impl fmt::Display for MessageError {

src/rc/strong.rs

@@ -6,6 +6,7 @@ use crate::runtime::{Object, self};
 use super::WeakPtr;
 
 /// A pointer that strongly references an object, ensuring it won't be deallocated.
+#[derive(Debug, PartialEq)]
 pub struct StrongPtr(*mut Object);
 
 impl StrongPtr {

src/rc/weak.rs

@@ -10,6 +10,7 @@ use super::StrongPtr;
 
 /// A pointer that weakly references an object, allowing to safely check
 /// whether it has been deallocated.
+#[derive(Debug)]
 pub struct WeakPtr(Box<UnsafeCell<*mut Object>>);
 
 impl WeakPtr {